Alas, I'll have to disappoint you, because this question will remain unanswered..

And just a quick acknowledgement as to why - there's an iron rule, unwritten, yet clear to everyone who've ventured down this path. A soldier's never asked about their past nor reasons behind such decision (with the exception of "Gestapo" in Aubagne) - it's considered a personal matter and as such understood and respected. Suffice it to say, a future legionnaire knows they're born to enter this "family"..